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<title>Using as: MSP430-Regs</title>

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<a name="MSP430_002dRegs"></a>
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<a name="Register-Names-11"></a>
<h4 class="subsubsection">9.29.2.3 Register Names</h4>

<a name="index-MSP-430-register-names"></a>
<a name="index-register-names_002c-MSP-430"></a>
<p>General-purpose registers are represented by predefined symbols of the
form &lsquo;<samp>r<var>N</var></samp>&rsquo; (for global registers), where <var>N</var> represents
a number between <code>0</code> and <code>15</code>.  The leading
letters may be in either upper or lower case; for example, &lsquo;<samp>r13</samp>&rsquo;
and &lsquo;<samp>R7</samp>&rsquo; are both valid register names.
</p>
<a name="index-special-purpose-registers_002c-MSP-430"></a>
<p>Register names &lsquo;<samp>PC</samp>&rsquo;, &lsquo;<samp>SP</samp>&rsquo; and &lsquo;<samp>SR</samp>&rsquo; cannot be used as register names
and will be treated as variables. Use &lsquo;<samp>r0</samp>&rsquo;, &lsquo;<samp>r1</samp>&rsquo;, and &lsquo;<samp>r2</samp>&rsquo; instead.
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